Basic linear algebra subroutine BLAS

The Basic Linear Algebra Subroutines (BLAS) are a convenient way of maintaining efficiency and portability. They should be extended to include such things as GATHER, and vectorized EXP, SQRT, SIN and COS. 

In general, one of the first steps in optimizing codes for these architectures is implementation of standard basic linear algebra subroutines (BLAS). These routines—continuously being improved, expanded, and adapted optimally to more machines—perform operations such as dot products (xTy) and... 

The summing of the force on particle I can be performed by the BLAS (8)(Basic Linear Algebra Subroutine) SDOT, which is quite efficient (about 3.5 machine cycles/element). 

The BLAS are a collection of 38 FORTRAN callable subroutines that peform many of the basic operations of numerical linear algebra. Contact International Mathematical and Statistical Libraries, (IMSL) for more information. 

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